CurseForge · Minecraft mod
Alfheim Lighting Engine
Alfheim is a lighting engine replacement for Minecraft, optimized for performance and fixing many bugs
Quick answer
Which Alfheim Lighting Engine release should I use?
Alfheim Lighting Engine Alfheim 1.6 targets 1.12.2 with Forge. The project page does not say whether this file belongs on the client, dedicated server, or both. All 2 required mods have matching files.
Where it goes
Is Alfheim Lighting Engine required on the client, server, or both?
The project page does not say whether this file belongs on the client, dedicated server, or both.
The source does not explicitly classify this release as client-only or server-only.
What else does Alfheim Lighting Engine Alfheim 1.6 need?
Alfheim 1.6. Change the file and its required mods may change too.
Install Red Core, MixinBooter first. We found matching files for this game-version and loader setup.
We only count dependency files that match this setup. A file for another loader does not fill the gap.
Before you install it
Add Alfheim Lighting Engine without breaking your instance.
Built for Alfheim Lighting Engine Alfheim 1.6. Pick another file and the loader, install side or required mods may change.
- 01
Stick to this file
Use Alfheim 1.6. It targets 1.12.2 with Forge; another release may have different loader, side or dependency requirements.
- 02
Bring the mods it needs
Install Red Core, MixinBooter first. We found matching files for this game-version and loader setup.
- 03
Put it on the correct side
The project page does not say whether this file belongs on the client, dedicated server, or both.
- 04
Pick the file you checked
Use the “Get this file” button beside Alfheim 1.6. It opens that exact file at the source.
About this project
What does Alfheim Lighting Engine add?
Alfheim
Alfheim is a fork (or a rewrite depending on your views on the ship of Theseus) of Hesperus which is a fork of Phosphor
What benefit does this have over Phosphor/Hesperus?
Alfheim aims to be compatible in all scenarios, and if for any reasons a something is fundamentally incompatible, a warning will tell you what is happening instead of crashing with hardly any information.
Alfheim also has a lot of optimizations of all sizes over Phosphor/Hesperus it uses slightly less memory overall.
Alfheim also improves client side performance unlike Phosphor/Hesperus, by reducing by lighting related block updates by a factor of 27. To improve client side performance, Alfheim also limits how much lighting updates are performed each frame. In addition, Phosphor/Hesperus unnecessarily forces lights to be updates before each frame which Alfheim doesn't.
Alfheim also fixes more vanilla lighting issues than Phosphor/Hesperus, here is a list of all fixes and where they come from:
Fixed in Alfheim:
Why not just PR to Hesperus?
Fair question, the reason is simple, Alfheim compared to Hesperus isn't just a fork to fix bugs, it is my continuation of it. And as seen in the past, my continuations of mods aren't just modifying some things, they are pretty invasive and basically change everything internally.
It wasn't this way at first, I wanted to PR some stuff to Hesperus but after doing parts of it, it became clear that it had grown bigger than a PR. So then I decided to do Alfheim, for now it includes optimizations, bug fixes and compatibility fixes, but later down the line I have more plans.
Want to have your own mod or support me?
If you're looking for a mod but don't have the development skills or time, consider commissioning me! My commissions are currently open and I would be happy to create a custom mod to fit your needs as long as you provide assets.
You can also support me on a monthly basis by becoming a member. To thank you will have the possibility to access exclusive post and messages, Discord channel for WIP content, and even access to unreleased Prototypes or WIP Projects.
You can also buy me a hot chocolate.
Project description from CurseForge.
Pick your setup
Alfheim Lighting Engine by Minecraft version and loader
Choose the version and loader you play, then open the matching release.
1.12.2
1 loader buildCheck the dependencies, then try the file in a copied instance before changing a world you care about.
Recent files
Alfheim Lighting Engine versions and loaders
Alfheim 1.6
Alfheim-1.6.jar
23 Jun 2025
Alfheim 1.6 Dev 2
Alfheim-1.6-Dev-2.jar
12 Mar 2025
Alfheim 1.5
Alfheim-1.5.jar
11 Feb 2025
Alfheim 1.4
Alfheim-1.4.jar
21 Aug 2024
Alfheim 1.3
Alfheim-1.3.jar
28 Mar 2024
Alfheim 1.2
Alfheim-1.2.jar
11 Dec 2023
Alfheim 1.1.1
Alfheim-1.1.1.jar
19 Nov 2023
Alfheim 1.1
Alfheim-1.1.jar
18 Nov 2023
Alfheim 1.0.2
Alfheim-1.0.2.jar
12 Sept 2023
Alfheim 1.0.1
Alfheim-1.0.1.jar
8 Sept 2023
Alfheim 1.0
Alfheim-1.0.jar
6 Sept 2023
Looking for an older file? The official CurseForge project page is in Resources.